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Edge-localized mode mitigation enabled by active control of pedestal density gradient with new EAST tokamak divertor.

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Název: Edge-localized mode mitigation enabled by active control of pedestal density gradient with new EAST tokamak divertor.
Autoři: Lin, X., Yang, Q. Q., Xu, G. S., Jia, G. Z., Zhang, C., Wang, Y. F., Li, N. M., Yan, N., Chen, R., Xu, X. Q., Guo, H. Y., Wang, L., Liu, S. C., Zang, Q., Zhang, T., Zhong, F. B., Jin, Y. F.
Zdroj: Physics of Plasmas; Jan2025, Vol. 32 Issue 1, p1-15, 15p
Témata: PLASMA density, SAFETY factor in engineering, PEDESTALS, TOKAMAKS, DENSITY, FUSION reactor divertors
Abstrakt: Mitigation of large edge-localized modes (ELMs) has been achieved by actively reducing the pedestal density gradient with the EAST new right-angled lower divertor through changing the strike point position from the vertical target to the horizontal target. A series of dedicated experiments in the 2021–2024 EAST campaigns demonstrate that this ELM control solution is highly reproducible in a broad parameter space of edge safety factor q95 = 4.7–7.1, heating power Ptotal = 2.3–5 MW, and pedestal collisionality ν e , ped * = 1–6, under both favorable and unfavorable magnetic configurations. Higher plasma density could facilitate the achievement of this ELM control solution. Statistical results indicate that the ELM mitigation effect can be observed at relatively larger Greenwald density fraction of fGW > 0.47. In addition, this ELM mitigation effect can be achieved with both lithium-coated and boronized metal walls. The pedestal density gradient is systematically lower in the horizontal target case than that of the vertical target case when the ELM mitigation effect can be observed. SOLPS-ITER simulation results indicate that the pedestal fueling from divertor recycling is significantly lower in the horizontal target case. This could contribute to the formation of a flattened pedestal density profile with small ELMs. [ABSTRACT FROM AUTHOR]
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Abstrakt:Mitigation of large edge-localized modes (ELMs) has been achieved by actively reducing the pedestal density gradient with the EAST new right-angled lower divertor through changing the strike point position from the vertical target to the horizontal target. A series of dedicated experiments in the 2021–2024 EAST campaigns demonstrate that this ELM control solution is highly reproducible in a broad parameter space of edge safety factor q<subscript>95</subscript> = 4.7–7.1, heating power P<subscript>total</subscript> = 2.3–5 MW, and pedestal collisionality ν e , ped * = 1–6, under both favorable and unfavorable magnetic configurations. Higher plasma density could facilitate the achievement of this ELM control solution. Statistical results indicate that the ELM mitigation effect can be observed at relatively larger Greenwald density fraction of f<subscript>GW</subscript> > 0.47. In addition, this ELM mitigation effect can be achieved with both lithium-coated and boronized metal walls. The pedestal density gradient is systematically lower in the horizontal target case than that of the vertical target case when the ELM mitigation effect can be observed. SOLPS-ITER simulation results indicate that the pedestal fueling from divertor recycling is significantly lower in the horizontal target case. This could contribute to the formation of a flattened pedestal density profile with small ELMs. [ABSTRACT FROM AUTHOR]
ISSN:1070664X
DOI:10.1063/5.0237976